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Esmaeil Fallahi

Blossom thinning of `Early Spur Rome' apple (Malus domestica Borkh.) and `Redhaven' peach (Prunus persica L.) with hydrogen cyanamide (Dormex, 50% a.i.), endothalic acid [(Endothal, 0.4 lb a.i./gal (47.93 g a.i./L)], and pelargonic acid (Thinex, 60% a.i.) was studied in 1995 and 1996. Full-bloom applications of hydrogen cyanamide at 2 pt formulation/100 gal (1288 mg a.i./L) and 2.5 pt formulation/100 gal (1610 mg a.i./L) or endothalic acid at 1 pt formulation/100 gal (59.9 mg a.i./L), once at 70% bloom and again at full bloom, reduced apple fruit set. Pelargonic acid was only effective in thinning apple blossoms when applied twice—at 40% bloom and again at full bloom—at 1.5 pt formulation/100 gal (1.12 mL a.i./L) per application. Pelargonic acid marked apples in 1995 but not 1996. Neither hydrogen cyanamide nor endothalic acid marked apples. A single full-bloom application of hydrogen cyanamide, endothalic acid, or pelargonic acid effectively thinned peach blossoms in 1995; however, in 1996, only hydrogen cyanamide at 2.5 pt formulation/100 gal effectively thinned peach blossoms. Peaches did not show fruit marks with any of the peach blossom thinners.

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Guadalupe Osorio-Acosta, Jorge Siller-Cepeda, and Jorge Avlos

In the Sonoran desert, vines are forced to break with early pruning and cyanamide application. Usually topping of the canes (leaving canes 50 cm long) is done on 10 Dec. to facilitate spur pruning and cyanamide application after 20 Dec. However, budbreak is irregular over the years. There is no reason why date and intensity of topping is done that way. The objective of this work was to evaluate budbreak at different dates and intensity of topping. Five-year-old `Flame Seedless' vines were prune topped on three dates (21 Nov., 1 Dec., and 11 Dec.) and at three different intensities (leaving canes 25, 50, and 75 cm long). A control block was also included without top pruning. Spur pruning and cyanamide application (Dormex 7%) was done on 24 Dec. Budbreak on canes left 50 cm long before spur pruning was 83%, 84%, and 58% on 21 Nov., 1 Dec., and 11 Dec., respectively, while nontop-pruned plants break only 58% of the buds. Number of clusters per plant in the same order were 52, 42, 39, and 26, respectively. There was an interaction of date and intensity of topping with the cluster number, since slight topping (leaving 75 cm long canes) on 1 and 11 Dec. improved the number of clusters per vine up to 47 and 60, respectively.

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Esmaeil Fallahi, Randy R. Lee, and Gary A. Lee

Hydrogen cyanamide (Dormex, 50% a.i.) for blossom thinning `Early Spur Rome' and `Law Rome' apple (Malus×domestica Borkh.) and `Flavorcrest' peach (Prunus persica L.) was applied with air-blast sprayers on a commercial scale. Full-bloom applications of hydrogen cyanamide at 4 pts formulation per 200 gal/acre (1288 mg·L−1) and 5 pts formulation per 200 gal/acre (1610 mg·L−1) significantly reduced fruit set in apple and peach. In `Early Spur Rome', a postbloom application of carbaryl [Sevin XLR Plus, 4 lb a.i./gal (0.48 kg·L−1)] following a full-bloom spray of hydrogen cyanamide increased fruit thinning with a significant increase in fruit size compared to an application of hydrogen cyanamide alone. In `Law Rome', trees receiving a full-bloom application of hydrogen cyanamide followed by a postbloom application of 1-naphthyl-N-methylcarbamate (carbaryl) + naphthalene acetic acid (NAA) had significantly lower fruit set and larger fruit than those in the carbaryl + NAA treatment. Apples or peaches were not marked by hydrogen cyanamide.

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Jeffrey G. Williamson and D. Scott NeSmith

.5% Dormex, Degussa Ag, Trostberg, Germany) spray (applied until runoff) to plants during stage 5 of bloom ( Spiers, 1978 ). Treatments were applied to five-plant plots, and there were four replications of each treatment–cultivar combination arranged in a

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Ed Stover, Youjian Lin, Xiaoe Yang, and Tripti Vashisth

cyanamide. Cyanamide was applied as the product Dormex (SKW Trostberg, Trostberg, Germany) which is 50% a.i. No additional surfactant was used. Screenhouse experiment. This experiment was conducted in a screenhouse in Ft. Pierce, FL. To determine an

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Givago Coutinho, Rafael Pio, Filipe Bittencourt Machado de Souza, Daniela da Hora Farias, Adriano Teodoro Bruzi, and Paulo Henrique Sales Guimarães

(2013–16). In pruning, excess branches were removed from the inner portion of the canopy. The branches facing the canopy end were reduced by up to 25 cm. Fifteen days after pruning, hydrogen cyanamide (HC) (Dormex @ , 49% HC, SKW, Trostberg, Germany) was

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Bernadine C. Strik, John R. Clark, Chad E. Finn, and M. Pilar Bañados

to limit yield loss at fruit maturation. Usually a simple two- or four-wire trellis is used, but canes are usually not tied to the wire. In Georgia, U.S., hydrogen cyanamide (Dormex; SKW Trostberg AG, Trostberg, Germany) is applied in some years to

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Ashley K. Brantley, James D. Spiers, Andrew B. Thompson, James A. Pitts, J. Raymond Kessler Jr., Amy N. Wright, and Elina D. Coneva

industry ISHS Acta Hort. 1055 55 62 Powell, A.A. Himelrick, D.G. Tunnell, E. 2000 Effect of hydrogen cyanimide (Dormex) on replacing lack of chilling in kiwifruit ( Actinidia deliciosa ) Small Fruit Rev. 1 79 87 Reil, W.O. 1994 Vineyard planning, design

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Lisa Tang, Shweta Chhajed, Tripti Vashisth, Mercy A. Olmstead, James W. Olmstead, and Thomas A. Colquhoun

. Palasciano, M. Ferrara, G. Camposeo, S. Pacifico, A. 2008 On the advancement of bud break and fruit ripening induced by hydrogen cyanamide (Dormex®) in sweet cherry: A three-year study Acta Hort. 795 469 478 Gookin, T.E. Hunter, D.A. Reid, M.S. 2003 Temporal